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(ModeL) LOOK.

No. 428,553. Patented May 20,1890.

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I UNITED STATES.

PATENT OFFICE.

OSBORNE R. OOOKE, OF SALEM, OHIO.

LOCK.

SPECIFICATION forming part of Letters Patent No. 428,553, dated May 20,1890.

Application filed May 28, 1889- Serial No. 312,350. (Modeh) To an whomit Duty concern:

Be it known that I, OSBORNE R. (looks, of Salem, in the county ofColumbiana and State of Ohio, have invented certain new and usefulImprovements in Mortise-Locks; and I do hereby declare the following tobea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and usethe same.

My invention relates to improvements in mortise-locks of the varietyknown as barrellock, the object being to provide a strong, simple, anddurable lock of the variety aforesaid reduced to such small compass thatthe barrel or cylindrical portion thereof may be inserted in a holebored in the edge of a door of moderate thickness.

Vith these objects in View my invention consists in certain features ofconstruction and in combination of parts hereinafter described, andpointed out in the claims.

Heretofore'the cost of attaching mortiselocks was likely to be as muchor more than the price of a lock. Myimproved lock is'designed toovercome in the main the cost of attaching the lock to the door, thesame requiring no skilled labor and involving but little trouble andexpense.

In the accompanying drawings, Figure l is a side elevation. Figs. 2 and3 are side elevations with the cap removed, the former showing thetumblers in position locking the bolt and the latter showing thetumblers retired and the bolt free to be operated from the knob-spindleattachments. Fig. 4 is a plan showing the casing in section. Fig. 5 is aplan of the bolt detached. Fig. 6 is a perspective of tumbler stock oryoke. Fig. 7 is a side elevation of one of the tumblers detached. Fig. 8is a view in perspective of one set of links detached.

The barrel or cylindrical section of the lock is substantially inhalves, respectively A and A, the former being rigidly secured to andthe latter being detachably connected with faceplate A the cap orsection A being secured to member A by means of a single screw or pin a.The casing is provided on opposite sides with holes a, in which isjournaled hub B of the knob-spindle B. The casing has also key-hole a 0represents the bolt, D D the tumblers,

and E a sliding yoke or stop for blocking the tumblers in position forlocking the bolt.

Edge views of the bolt are shown in Figs. 2 and 3, while the planthereof is shown more clearly in Fig. 4, the central portion of the boltbeing cored or slotted at C to receive the two tumblers and yoke E, thetumblers embracing the central portion of the yoke. I-Iu b B is providedin the usual manner with a square socket for receiving the knob-spindle.In place of the long cams usually attached to this hub for withdrawingthe bolt I provide the following: Hub B is provided on approximatelyopposite sides with loops 6 b for receh'ing links I, the latter havingT-heads 2' 1'. Hub B is provided with a deep groove 1),

extending under and within the span of each loop I), and by turning linkI edgewise to the periphery of the hub head i of the link may be passedthrough under the respective loops .1), after which, by turning the linkfiatwise to the periphery of the hub, head 7; prevents the link fromwithdrawing from its embracing-loop, the link, however, having an easyfit in the loop. Links J are of the variety shown more clearly in Fig.8, the same somewhat resembling a flat chain-link. Links J embrace linksI, and the former embrace cross-bar O of the bolt near the extremes ofthe cross-bar, the latter being notched at c for seating the link, andthe cross-bar extending so close to the casing as to prevent the slacklink from slipping off the cross-bar in manipulating the look. WVithsuch construction the parts are reduced to small compass, and thenecessary end movement for withdrawing the bolt is secured by windingthe taut links, so to speak, around hub B, the slack links meantimetrending inward and taking care of themselves, and of course the boltmay be withdrawn by turning the knob in either direction.

Of course more and shorter links could be employed, but with theconstruction shown the links will wrap around hub B far enough for thepurpose, something less than a quarter-turn of the hub in eitherdirection being all the movement that is necessary. The bolt along thecentral portion thereof is ofiset upward to clear the line of thekey-holes and to clear screw a. The outer end wall 0 of slot 0 slopesupward and inward, constituting an incline for purposes hereinaftermentioned, and along, the central portion of this incline is a groove 0for receiving boltspring F when the bolt is withdrawn. The bolt is alsoprovided with an upwardly-projecting lug c for engaging the bolt-spring,whereby a longer leg, and consequently longer sweep of the spring, issecured. Tumblers D are fulcrumed on screw a and are arranged nextinside the side members of the bolt. The tumblers are approximately ofthe form shown, except that section D thereof for engagingthe key may ofcourse be varied according to the wards of the key. Each tumbler isprovided with spring D for depressing the tumbler, the free end of thespring bearing against the casing. The forward end of each tumblerterminates in a finger d for engaging the inclined wall 0 aforesaid ofthe bolt, and the under edge of the finger, near the inner endthereof,"is notched, as shown, leaving approximately a square shoulder61. But two tumblers are shown; but the number may be increased bymaking these tumblers thinner.

Yoke E fits easily between the top and bottom walls of the casing andfits easily between the tumblers and has a limited end movement, screwto constituting a stop for the yoke in the one direction. The keyengages alternately the walls E and E of the yoke, but the arch of theyoke is high enough to clear the ward of the key that operates the yoke.The forward or outer end of the yoke terminates in a foot 6 broad enoughto receive the different tumblers, this foot being notched at e tostraddle spring F, and the extreme of the foot having upturned toes 6With the position of parts shown in Fig. 3 the tumblers are disengagedfrom the bolt, leaving the latter free to be withdrawn by the action ofthe knob-spindle mechanism aforesaid.

If it is desired to lock the bolt, the key is inserted and turned in thedirection of the arrow, the first engagement of the key being with thetumbler, elevating the latter, so that fingers d engage incline c of thebolt, and in case the bolt-spring has failed to shoot the bolt its fullthrow the engagement with these fingers of the tumbler with the inclineof the bolt will thrust the bolt outward its full throw. Meantime, andwith the tumblers held elevated by the key, the latter engages wall E ofthe yoke, thereby moving the yoke forward and bringing the foot ,of theyoke under the notched section of fingers d, causing the toes of theyoke to enter the notches in the tumblers, the toes and shoulders atinterlocking. As the key completes its revolution the tumblers aredepressed by the action of springs D causing the tumblers to rest firmlyon the foot of the yoke, the latter, however, blocking the tumbler insuch elevated position that the fingers of the tumbler are opposite wall0 of the bolt, and consequently locking the bolt. By turning the key inthe reverse direction the tumblers are first elevated by the key, afterwhich the key by engaging wall E of the yoke reverses the latter,bringing the parts to the place of beginning-that is to say, with thebolt unfa'stened. The arrangement of parts whereby the tumblers arepivoted on the securing screw or pin of the cas-.

ing simplifies the construction and reduces somewhat the initial cost.

hat I claim is 1. The combination, with a sectional casing, aspring-actuated bolt, and a knob-spindle for actuating the bolt, ofvibrating tumblers actuated by direct engagement of the key and adaptedto engage the bolt and hold the latter in locked position, and devicesadapted to slide back and forth and actuated in both directions by thekey, the said de? vices adapted to hold the tumblersin cont-act with thebolt, substantially as set forth.

2. In combination, a bolt having a shoulder, vibrating tumblers forengaging such shoulder, and a sliding yoke for blocking the tumblers intheir elevated position, substantially as set forth.

3. The combination, with a bolt having an inclined wall, of vibratingtumblers for engaging said inclined wall, whereby the elevation of thetumblers locks the bolt and insures a full outward throw of the bolt,substantially as indicated, and a sliding yoke having a projection forengaging the tumblers for blocking them in their elevated positions,substantially as set forth.

In testimony whereof I sign this specification in the presence of twowitnesses.

. OSBORNE R. (JOOKE.

Witnesses: W. R. l\/IILLER, RICHARD Pow.

